21+m=4m+12

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Solution for 21+m=4m+12 equation:


Simplifying
21 + m = 4m + 12

Reorder the terms:
21 + m = 12 + 4m

Solving
21 + m = 12 + 4m

Solving for variable 'm'.

Move all terms containing m to the left, all other terms to the right.

Add '-4m' to each side of the equation.
21 + m + -4m = 12 + 4m + -4m

Combine like terms: m + -4m = -3m
21 + -3m = 12 + 4m + -4m

Combine like terms: 4m + -4m = 0
21 + -3m = 12 + 0
21 + -3m = 12

Add '-21' to each side of the equation.
21 + -21 + -3m = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -3m = 12 + -21
-3m = 12 + -21

Combine like terms: 12 + -21 = -9
-3m = -9

Divide each side by '-3'.
m = 3

Simplifying
m = 3

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